Step by PGC Self-Assessment Test
Collection of MCQs from Step by PGC Self-Assessment Test collected from mdcat session 2019-20.
STEP Entry Test Preparation (MCAT, BIOLOGY)
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STEP ENTRY TEST SELF ASSESSMENT BIOLOGY 2020
2. The carbon-carbon bonds in
unsaturated carbon compounds
a Single
(-) only
b Double
only (=)
c Triple
( = ) only
d Double
( = ) or triple ( = )
3. Condensation means
a Removal
of water
b Addition
of water
c Removal
of hydrogen
d Addition
of hydrogen
4. The monomers of proteins are
a Amino
acids
b Nucleotides
c Amino acids & nucleotides
d Monosaccharides
5. Which one of following is incorrect
about carbohydrates
a Contain
C, H, & O
b Contain no hydroxyl group
c All
are aldehydes or ketones
d Cx(H2O)y is general formula
6. In monosaccharides, all the carbon
atoms except one have a
a Aldehyde
group
b Keto group
c Aldehyde or keto group
d Hydroxyl group
7. Glyceraldehyde is
a Triose
b Tetroses
c Pentose
d Hexose
8. Monosaccharides are
a Reducing
sugars
b Non reducing sugar
c Reducing
and non reducing sugars
d Oxidizing sugar
9. Glycosidic bond between two
monosaccharides in
a 1,2
linkage
b 1,4 linkage
c 2,1 linkage
d 4,1 linkage
10. The main source of carbohydrates for
animals
a Glycogen
b Starch
c Glycogen
& starch
d Cellulose
11. With iodine, cellulose gives
a Red
color
b Blue color
c Pink color
d No color
12. Lipids are
a Water
soluble organic substances
b Water soluble inorganic substance
c Water insoluble organic substances
d Water insoluble inorganic substances
13. Lipids are formed by condensation
reaction between
a Fatty
acid & alkane
b Fatty acid & alcohol
c Fatty acid & alkene
d Fatty acid & alkyne
14. The General formula of fatty acids is
a R.
COOH
b R.
COH
c COOH
d R.
HCOOH
15. In animals, the fatty acids are
a Branched
b Ringed
c Branched or ringed
d Straight
16. Which one of following is incorrect
about fats & oils
a Lighter
than water
b Specific
gravity about 0.8
c Both
are liquid at room temperature
d Are not crystalline except some
17. Which one of following is correct about
phospholipid molecule
a Polar
head containing fatty acid
b Non polar tail containing fatty acid
c Polar
tail containing phosphate
d Non
polar head containing phosphate
18. Lecithin is
a Phosphatidylchaline
b Phosphatidic
acid
c Phospholipid molecule
d Wax
19. All of followings are Terpenoids except
a Terpene
b Choline
c Rubber
d Steroids
20. Phosphatidic acid is composed of
a Glycerol
& 2 fatty acid
b 2 fatty acids and a phosphoric acid
c Glycerol, 2 fatty acid &
nitrogenous base
d Glycerol,
2 fatty acid, & a phosphoric acid
21. Types of amino acids in cells &
tissues
a 20 b 25
c 120 d 170
22. The variable part of an amino acid
a R-group
b NH2
c COOH
d Hydrogen
atom
23. In Alanine, R is
a Hydrogen
b Hydroxyl
c CH3
d NH3
24. In proteins amino acids are joined
together by
a Ionic
bonds
b Peptide bonds
c Disulphide & hydrogen bonds
d Ionic, disulphide, hydrogen,
hydrophobic
25. Proteins always contain the elements
a C, H,
O
b C, H,
O, N, S
c C, H,
O, N
d C, H,
O, N, S
26. The potential variety of protein because
a R
group of amino acids
b NH2 group of amino acid
c COOH group of amino acid
d Specific sequence of amino acids
27. The most abundant organic molecule of a
cell
a Carbohydrate
b Proteins
c Lipids
d Water
28. The first person of work out the
complete amino acid sequence of a protein was
a F.
Sanger
b F. Miescher
c Erwin Chargaff
d Francis crick
29. The types of proteins in the human body
a 20
b 25
c 120
d In
thousands
30. B-pleated sheet is an example of
a Primary
structure
b Secondary structure
c Tertiary
structure
d Quarternary structure
31. The globule proteins are
a Tertiary
structure containing 3 types of bonds
b Tertiary structure containing 4
types of bonds
c Quarternary structure containing 3
types of bonds
d Quarternary structure containing 4
types of bonds
32. Haemoglobin shows a strcutre
a Primary
b Secondary
c Tertiary
d Quarternary
33. Denaturation of proteins is the loss of
a Amino
acids from protein
b Sequence
of amino acids
c 3-dimensional
shape of protein
d Sequence
& shape
34. Enzymes are the most important group of
a Carbohydrates
b Proteins
c Fats
d Carbohydrates
& proteins
35. If the non-protein part of enzyme is
covalently bonded, it is known as
a Co-factor
b Co enzyme
c Activator
d Prosthetic group
36. The presence of enzymes does not affect
the nature of
a Substrate
b Product
c Substrate & product
d ES complex
37. Every enzyme reacts with substrate by
virtue of its
a Shape
b Concentration
c Shape & concentration
d Specificity
38. An enzyme and its substrate react with
each other through
a Globular
shape
b Active
site
c Reaction site
d Passive site
39. Lock and key model of enzyme action was
proposed by
a F.
Miescher
b F. Sanger
c Koshland
d Emil Fischer
40. The reaction rate is directly
proportional to the substrate available if the
a Concentration
of substrate is high
b Concentration
of substrate is low
c Concentration
of enzyme is low
d Concentration
of enzyme & substrate is low
41. Heat provides
a Activation
energy
b Kinetic
energy
c Activation
& kinetic energy
d Kinetic
& potential energy
42. Optimum pH for Enterokinase is
a 4.50 b 5.50
c 6.80 d 7.60
43. An inhibitor is a chemical substance
which
a Can
not react with enzyme
b Can react with enzyme & is
transformed into products
c Can
react with enzyme but is not transformed into product
d Can
or can not react with enzyme
44. Enzymes are composed of hundreds of
a Nucleic
acids
b Amino acids
c Phosphoric
acids
d Fatty acids
45. The enzymes which carry out the
synthesis of proteins are integral part of
a Ribosomes
b Mitochondria
c Chloroplast
d Cytoplasm
46. The active site of an enzyme consist of
region
a One b Two
c Three d Four
47. If there is no effect on already
occurring enzymetic reaction on adding more substrate it is
a Denaturation
b Saturation
c Inhibition
d Composition
48. The rate of enzyme catalyzed reaction
a Decreases
as substrate concentrations increases
b Is
constant under all conditions
c Can be reduced by inhibitors
d Can not be measured
50. Which statement about enzymes is not
true
a Sensitive
to heat
b Non-specific
in action
c Change
the rate of catalyzed reaction
d Consists
of proteins
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